A gene whose expression helps to identify transformed cell is known as:

1.	Vector	2.	Plasmid
3.	Structural gene	4.	Selectable marker

What is the criterion for the movement of DNA fragments on agarose gel during gel electrophoresis?

1. The smaller the fragment size, the farther it moves

2. Positively charged fragment move to farther end

3. Negatively charged fragments do not move 

4. The larger the fragment size, the farther it moves

The cutting of DNA at specific locations became possible with the discovery of?

1. Restriction enzymes

2. Probes

3. Selectable markets

4. ligases

Which vector can clone only a small fragment of DNA?

1. Bacterial artificial chromosome

2. Yeast artificial chromosome

3. Plasmid

4. Cosmid

DNA fragments generated by the restriction endonucleases in a chemical reaction can be separated by:

1. Polymerase chain reaction

2. Electrophoresis

3. Restriction mapping

4. Centrifugation

The figure below is the diagrammatic representation of the E.coli vector pBR 322. Which one of the given options correctly identifies its certain components (s)? 
 
1. Ori-original restriction enzyme

2. Rop-reduced osmotic pressure

3. Hind III, Eco RI-selectable markers

4. Amp^R, teti^R-antibiotic resistance genes

Which one of the following is a case of wrong matching?